The requirement is for a quantity of three units of a specific National Stock Number item, with delivery FOB origin. The government lacks sufficient technical data to purchase from other than the currently approved source(s), and the item is flight critical, requiring government source approval prior to award. Only previously approved sources have been solicited, and new source approval typically cannot be processed without delaying award. Offerors who are not approved sources must submit all required source approval information as detailed in the NAVSUP WSS brochures. Award will be made only if the offeror, product, or manufacturer meets qualification requirements at the time of award.